I'd be happy with just a better combat system, I never really liked combat in FO 3, although it seemed a little more tolerable in NV. It didn't seem like the psuedo turn based mode or the real time mode was really fleshed out enough to be fun. For me I would have liked it better if they had focused on one good system rather then 2 mediocre ones, but I know some people liked it better then I did.